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Title

Nonlinear feedback control of a dual-stage actuator system for reduced settling time

Author(s)

Zheng, Jinchuan;  Fu, Minyue

Abstract

This brief presents a nonlinear control method for dual-stage actuator (DSA) systems to track a step command input fast and accurately. Conventional tracking controllers for DSA systems are generally designed to enable the primary actuator to approach the setpoint without overshoot. However, this strategy is unable to achieve the minimal settling time when the setpoints are beyond the secondary actuator travel limit. To further reduce the settling time, we design the primary actuator controller to yield a closed-loop system with a small damping ratio for a fast rise time and certain allowable overshoot. Then, a composite nonlinear control law is designed for the secondary actuator to reduce the overshoot caused by the primary actuator as the system output approaches the setpoint. The proposed control method is applied to an actual DSA positioning system, which consists of a linear motor and a piezo actuator. Experimental results demonstrate that our approach can further reduce the settling time significantly compared with the conventional control.

Publication type

Journal article

Source

IEEE Transactions on Control Systems Technology, Vol. 16, no. 4 (Jul 2008), pp. 717-725

Publication year

2008

FOR Code(s)

0102 Applied Mathematics;  0906 Electrical and Electronic Engineering

Keyword(s)

Actuators;  Analogue differential analyzers;  Closed-loop systems;  Control systems;  Conventional control;  Damping ratios;  Dual-stage actuators;  Fast rise time;  Friction;  Linear motor;  Motion control;  Nonlinear control laws;  Nonlinear feedback control;  Piezo actuators;  Positioning systems;  Saturation;  Sensitivity analysis;  Set points;  Settling time;  System output;  Tracking controllers

Publisher

IEEE

ISSN

1063-6536

Publisher URL

http://dx.doi.org/10.1109/tcst.2007.912125

Copyright

Copyright © 2008 IEEE. The published version is reproduced in accordance with the copyright policy of the publisher. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

Full text

Peer reviewed